例題 6Example 6

題目 Problem

Crank \(CB\) oscillates about \(C\) through a limited arc, causing crank \(OA\) to oscillate about \(O\). When the linkage passes the position shown with \(CB\) horizontal and \(OA\) vertical, the angular velocity of \(CB\) is \(2\ \text{rad/s}\) counterclockwise. For this instant determine the angular velocities of \(OA\) and \(AB\). If the angular velocity of \(CB\) is constant during a short interval of its motion, determine the angular acceleration of links \(AB\) and \(OA\) for this position.